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Title: Shape coexistence from lifetime and branching-ratio measurements in 68,70Ni

Shape coexistence near closed-shell nuclei, whereby states associated with deformed shapes appear at relatively low excitation energy alongside spherical ones, is indicative of the rapid change in structure that can occur with the addition or removal of a few protons or neutrons. Near 68Ni (Z=28, N=40), the identification of shape coexistence hinges on hitherto undetermined transition rates to and from low-energy 0+ states. In 68,70Ni, new lifetimes and branching ratios have been measured. These data enable quantitative descriptions of the 0+ states through the deduced transition rates and serve as sensitive probes for characterizing their nuclear wave functions. The results are compared to, and consistent with, large-scale shell-model calculations which predict shape coexistence. With the firm identification of this phenomenon near 68Ni, shape coexistence is now observed in all currently accessible regions of the nuclear chart with closed proton shells and mid-shell neutrons.
Authors:
ORCiD logo [1] ;  [2] ;  [2] ;  [3] ;  [4] ;  [4] ;  [5] ;  [1] ;  [6] ;  [4] ;  [7] ;  [3] ;  [8] ;  [9] ;  [4] ;  [2] ;  [4] ;  [2] ;  [7] ;  [10] more »;  [7] ;  [11] ;  [12] ;  [4] « less
  1. Michigan State Univ., East Lansing, MI (United States). National Superconducting Cyclotron Lab.
  2. Michigan State Univ., East Lansing, MI (United States). Dept. of Chemistry. National Superconducting Cyclotron Lab.
  3. Univ. of Tennessee, Knoxville, TN (United States). Dept. of Physics and Astronomy
  4. Argonne National Lab. (ANL), Argonne, IL (United States). Physics Division
  5. U.S. Army Research Lab., Adelphi, MD (United States)
  6. U.S. Army Research Lab., Adelphi, MD (United States). Oak Ridge Associated Universities Fellowship Program
  7. Michigan State Univ., East Lansing, MI (United States). Dept. of Physics. National Superconducting Cyclotron Lab.
  8. Univ. of Tennessee, Knoxville, TN (United States). Dept. of Physics and Astronomy; Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Physics Division
  9. Argonne National Lab. (ANL), Argonne, IL (United States). Physics Division; Univ. of Maryland, College Park, MD (United States). Dept. of Chemistry and Biochemistry
  10. Univ. of Padua (Italy). Dept. of Physics and Astronomy
  11. Univ. of California, Berkeley, CA (United States). Dept. of Nuclear Engineering
  12. Univ. of Maryland, College Park, MD (United States). Dept. of Chemistry and Biochemistry
Publication Date:
Grant/Contract Number:
NA0002132; NA0003221; NA0000979; NA0003180; AC02-06CH11357; FG02-94ER40834; FG02-96ER40983; PHY-1102511; PHY-1350234; W911NF-12-2-0019; AC-06CH11357
Type:
Published Article
Journal Name:
Physics Letters. Section B
Additional Journal Information:
Journal Volume: 763; Journal ID: ISSN 0370-2693
Publisher:
Elsevier
Research Org:
Argonne National Lab. (ANL), Argonne, IL (United States); U.S. Army Research Lab., Adelphi, MD (United States); Michigan State Univ., East Lansing, MI (United States); Univ. of Maryland, College Park, MD (United States); Univ. of Tennessee, Knoxville, TN (United States); Nuclear Science and Security Consortium, Berkeley, CA (United States)
Sponsoring Org:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26); USDOE National Nuclear Security Administration (NNSA); National Science Foundation (NSF); United States Army Research Lab. (ARL)
Contributing Orgs:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Padua (Italy); Univ. of California, Berkeley, CA (United States)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
OSTI Identifier:
1329262
Alternate Identifier(s):
OSTI ID: 1339169; OSTI ID: 1355349